Persee 2 - install ubuntu

I just acquired a new Persee 2 camera. It’s said in the specs that it supports ubuntu 18.04 but I didn’t see any documentation neither download links anywhere.
I gave a try by flashing it with Zora ubuntu image (image url from The reset button is hidden deep in the audio connector.
The flash procedure succeeded, but after a reboot, it ends on ubuntu login screen and no usb keyboard looks to work. Ethernet does not look responsive neither.
Is there a proper ubuntu image to flash for Persee 2, and eventually a documentation ?

You can find system download links listed on the Persee2’s datasheet.
For Ubuntu

For Android